Trees, 10-15 m tall. Young branchlets puberulent, glabrescent. Stipules inconspicuous; leaf glands 1-1.5 cm above base, and between junctions of 1 or 2 distal pairs of pinnae, elliptic or slitlike, 2-2.5 mm; pinnae 5-8 pairs, 4-10 cm; leaflets 10-22 pairs, sessile, oblong, 6-10(-15) × (3-)4-6 mm, abaxially puberulent with yellow hairs, adaxially glabrous with few scattered hairs, main vein close to upper margin, base asymmetrically truncate on one side, narrowly cuneate on other side, apex asymmetrically obtuse, mucronate. Corymbs ca. 35-flowered, axillary; peduncles ca. 5 cm. Flowers dimorphic, marginal flowers pedicellate. Calyx narrowly campanulate, ca. 3 mm; teeth triangular, 0.3-0.5 mm. Corolla funnel-shaped, 6.5-7 mm, puberulent; lobes ovate, ca. 2.5 mm. Staminal tube ca. as long as corolla tube. Ovary ca. 2.5 mm, glabrous; stipe ca. 0.5 mm. Legume dehiscent, brown, flat, ca. 14 × 3 cm, stalk ca. 6 mm, apex mucronate. Seeds ca. 10, elliptic, ca. 10 × 6-7 mm; pleurogram ca. 5 × 2 mm, parallel to margins of seed. Fl. May, fr. Aug-Nov.
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